I tried going to the site and couldn't even get on, it must be really overloaded and thus sluggish -- hope that means lots of people are donating. Had you already put your credit card info in when it wouldn't go any further? I don't know anything about the workings of their administration, but maybe you should email them pledging whatever amount, so they know they have it to run the ads -- until such time as you can actually post it to the site with your card.
Yes, I had put in all my credit card info. I included in my e-mail to them, the amount I was trying to donate, and my full name. I just went to their main site again, and had no trouble getting to it.
I reviewed all my inputs and found I'd forgotten to put in my zip code. After that, hitting "Contribute" got me to the next screen, where I was able to hit the "Charge my credit card" (or something like that) button. I think it worked this time, but the next screen I got after that was the blank donation page again, with all my info gone. Don't recall it working that way before. Oh well, hope they got my $$.